LM75AIMX/NOPB National Semiconductor, LM75AIMX/NOPB Datasheet

IC TEMP SENSOR WATCHDOG 8-SOIC

LM75AIMX/NOPB

Manufacturer Part Number
LM75AIMX/NOPB
Description
IC TEMP SENSOR WATCHDOG 8-SOIC
Manufacturer
National Semiconductor
Datasheets

Specifications of LM75AIMX/NOPB

Function
Temp Sensor, Watchdog
Topology
ADC (Sigma Delta), Comparator, Register Bank
Sensor Type
Internal
Sensing Temperature
-55°C ~ 125°C
Output Type
I²C™
Output Alarm
Yes
Output Fan
Yes
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Temperature Sensor Function
Temp Sensor
Interface Type
Serial (2-Wire)
Resolution
9b
Package Type
SOIC N
Operating Temperature (max)
125C
Operating Temperature Classification
Military
Operating Supply Voltage (min)
2.7V
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
For Use With
OM6285 - EVAL BOARD I2C-2002-1A568-4002 - DEMO BOARD I2C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM75AIMX

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM75AIMX/NOPB
Manufacturer:
TI
Quantity:
2 181
Part Number:
LM75AIMX/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
Part Number:
LM75AIMX/NOPB
0
© 2010 National Semiconductor Corporation
Digital Temperature Sensor and Thermal Watchdog with
Two-Wire Interface
General Description
The LM75A is an industry-standard digital temperature sen-
sor with an integrated Sigma-Delta analog-to-digital converter
and I
ature readings with an accuracy of ±2°C from -25°C to 100°
C and ±3°C over -55°C to 125°C.
The LM75A operates with a single supply from +2.7V to
+5.5V. Communication is accomplished over a 2-wire inter-
face which operates up to 400kHz. The LM75A has three
address pins, allowing up to eight LM75A devices to operate
on the same 2-wire bus. The LM75A has a dedicated over-
temperature output (O.S.) with programmable limit and hys-
teresis. This output has programmable fault tolerance, which
allows the user to define the number of consecutive error
conditions that must occur before O.S. is activated.
The wide temperature and supply range and I
make the LM75A ideal for a number of applications including
base stations, electronic test equipment, office electronics,
personal computers, and any other system where thermal
management is critical to performance. The LM75A is avail-
able in an SOP-8 package and an MSOP-8 package.
Simplified Block Diagram
I
2
C® is a registered trademark of Philips Corporation.
2
C
®
interface. The LM75A provides 9-bit digital temper-
12658
2
C interface
LM75A
■ 
■ 
■ 
Applications
Features
Key Specifications
Supply Voltage
Supply Current
Temperature Accuracy
General System Thermal Management
Communications Infrastructure
Electronic Test Equipment
Environmental Monitoring
No external components required
Shutdown mode to minimize power consumption
Up to eight LM75As can be connected to a single bus
Power up defaults permit stand-alone operation as
thermostat
LM75A
operating
shutdown
−25°C to 100°C
−55°C to 125°C
November 2, 2010
www.national.com
2.7V to 5.5V
280 μA (typ)
±2°C (max)
±3°C (max)
4 μA (typ)
1265819

Related parts for LM75AIMX/NOPB

LM75AIMX/NOPB Summary of contents

Page 1

... The LM75A is avail- able in an SOP-8 package and an MSOP-8 package. Simplified Block Diagram 2 I C® registered trademark of Philips Corporation. © 2010 National Semiconductor Corporation LM75A Applications ■ General System Thermal Management ■ Communications Infrastructure ■ ...

Page 2

Connection Diagram Pin Descriptions Label Pin # Serial Bi-Directional Data Line, SDA 1 Open Drain Clock Input SCL 2 Overtemperature Shutdown, O.S. 3 Open Drain Output GND 4 Power Supply Ground +V 8 Positive ...

Page 3

Ordering Information Order Package Number Marking LM75AIM LM75AIM LM75AIMX LM75AIM LM75AIMM T00A LM75AIMMX T00A LM75AIMME T00A NS Package Supply Transport Media Number Voltage M08A 3.3V units in Rail (SOP-8) M08A 3.3V, 5V 2500 units on Tape and Reel ...

Page 4

Absolute Maximum Ratings Supply Voltage Pin (+ Voltage at A0, A1and A2 Pins Voltage at OS, SCL and SDA Pins Input Current at any Pin (Note 2) Package Input Current (Note 2) Storage Temperature ESD Susceptibility (Note 4) ...

Page 5

Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for +V limits apply for MIN MAX Symbol Parameter V Logical “1” Input Voltage IN(1) V Logical “0” Input ...

Page 6

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: When the input voltage (V ) ...

Page 7

FIGURE 2. Temperature-to-Digital Transfer Function (Non-linear scale for clarity) FIGURE 3. Printed Circuit Board Used for Thermal Resistance Specifications 1265805 1265806 7 www.national.com ...

Page 8

Typical Performance Characteristics 1.0 Functional Description The LM75A temperature sensor incorporates a band-gap type temperature sensor and 9-bit ADC (Sigma-Delta Analog- to-Digital Converter). The temperature data output of the LM75A is available at all times via the ...

Page 9

Note 15: These interrupt mode resets of O.S. occur only when LM75A is read or placed in shutdown. Otherwise, O.S. would remain active indefinitely for any event. FIGURE 4. O.S. Output Temperature Response Diagram 1.4 TEMPERATURE DATA FORMAT Temperature data ...

Page 10

O.S. POLARITY The O.S. output can be programmed via the configuration register to be either active low (default mode), or active high. In active low mode the O.S. output goes low when triggered 1.10 INTERNAL REGISTER STRUCTURE There are ...

Page 11

POINTER REGISTER (Selects which registers will be read from or written to P0-P1: Register Select P3–P7: Must be kept zero. 1.12 TEMPERATURE REGISTER ...

Page 12

www.national.com 12 ...

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13 www.national.com ...

Page 14

Application Hints To get the expected results when measuring temperature with an integrated circuit temperature sensor like the LM75A important to understand that the sensor measures its own die temperature. For the LM75A, the best thermal path ...

Page 15

FIGURE 8. Simple Thermostat, Interface Optional FIGURE 9. Temperature Sensor with Loudmouth Alarm (Barking Watchdog) 15 1265821 1265822 www.national.com ...

Page 16

Physical Dimensions 8-Lead (0.150 Wide) Molded Small Outline Package (SOP), JEDEC www.national.com inches (millimeters) unless otherwise noted Order Number LM75AIM, LM75AIMX NS Package Number M08A 8-Lead (0.118 Wide) Molded Mini SOIC Wide Package Order Number LM75AIMM, LM75AIMMX NS Package Number ...

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Notes 17 www.national.com ...

Page 18

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